WO2023194106A1 - Propagation de paramètres d'informations de mouvement sur la base d'une direction de prédiction intra - Google Patents

Propagation de paramètres d'informations de mouvement sur la base d'une direction de prédiction intra Download PDF

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Publication number
WO2023194106A1
WO2023194106A1 PCT/EP2023/057365 EP2023057365W WO2023194106A1 WO 2023194106 A1 WO2023194106 A1 WO 2023194106A1 EP 2023057365 W EP2023057365 W EP 2023057365W WO 2023194106 A1 WO2023194106 A1 WO 2023194106A1
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Prior art keywords
motion information
buffer
video block
intra
encoding
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PCT/EP2023/057365
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English (en)
Inventor
Philippe Bordes
Franck Galpin
Antoine Robert
Guillaume Boisson
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Interdigital Ce Patent Holdings, Sas
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Publication of WO2023194106A1 publication Critical patent/WO2023194106A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/109—Selection of coding mode or of prediction mode among a plurality of temporal predictive coding modes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/136—Incoming video signal characteristics or properties
    • H04N19/137—Motion inside a coding unit, e.g. average field, frame or block difference
    • H04N19/139—Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/513—Processing of motion vectors
    • H04N19/517—Processing of motion vectors by encoding
    • H04N19/52—Processing of motion vectors by encoding by predictive encoding

Definitions

  • image and video coding schemes usually employ prediction, including motion vector prediction, and transform to leverage spatial and temporal redundancy in the video content.
  • prediction including motion vector prediction, and transform
  • intra or inter prediction is used to exploit the intra or inter frame correlation, then the differences between the original image and the predicted image, often denoted as prediction errors or prediction residuals, are transformed, quantized, and entropy coded.
  • the compressed data are decoded by inverse processes corresponding to the entropy coding, quantization, transform, and prediction.
  • an apparatus comprising a processor.
  • the processor can be configured to encode a block of a video or decode a bitstream by executing any of the aforementioned methods.
  • a non-transitory computer readable medium containing data content generated according to any of the described encoding embodiments or variants.
  • a bitstream is formatted to include data content generated according to any of the described encoding embodiments or variants.
  • Figure 2 illustrates a generic video decoding or decompression system.
  • Figure 9 illustrates an example of planar prediction mode.
  • Figure 11 illustrates an example of (a) 4 parameter affine model and (b) 6 parameter affine model.
  • DC uses reference samples to create a uniform prediction planar mode: uses reference samples to create a smooth prediction of the block directional modes: uses reference samples to “pad” these samples along a particular direction to create the prediction
  • MIP Tempox based Intra Prediction
  • the intra mode information may be propagated temporally and is made available with all the reconstructed CUs. For the current CUs coded in intra, this information is furtherly used to build the list of most probable modes (MPM) with neighboring reconstructed CUs, even if they were coded in inter mode:
  • MPM most probable modes
  • the geometric partitioning mode allows predicting one CU with two non- rectangular partitioning as depicted in some examples in Figure 3.
  • Each partition may be Inter (275) or Intra (260).
  • the samples of the inter partition are predicted with regular inter- prediction process, using motion compensated reference samples picked from one (uniprediction) reference picture.
  • the samples of the intra partition are predicted with regular intra prediction mode (IPM) and prediction process, where the available IPM candidates are the parallel angular mode against the GPM block boundary (Parallel mode), the perpendicular angular mode against the GPM block boundary (Perpendicular mode), and the Planar mode as shown Figure 3 a-c, respectively.
  • the CU is predicted with one partition inter and one partition intra.
  • the corresponding inter and intra parameters are stored in the Ml and IPM buffers at 4x4 resolution Figure 4(b).
  • the location of the intra parameters is mi((x+mvx)/si,(y+mvv)/si) (640), where (mvx.mw) is the motion vector of the inter prediction and si is the ratio between the current picture size and the motion info buffer size.
  • the intra prediction process in HEVC and WC consists of three steps:
  • the reference sample generation process is illustrated in Figure 6.
  • the reference samples ref[] are also known as L-shape.
  • a row of (2N+refldx) decoded samples on the top is formed from the previously reconstructed top and top right pixels to the current Pll.
  • a column of (2N+refldx) samples on the left is formed from the reconstructed left and below left pixels.
  • the intra sample prediction consists of predicting the pixels of the target CU based on the reference samples.
  • Planar and DC prediction modes are used to predict smooth and gradually changing regions
  • angular (angle defined from 45 degrees to -135 degrees in clockwise direction) prediction modes are used to capture different directional structures.
  • HEVC supports 33 directional prediction modes which are indexed from 2 to 34. These prediction modes correspond to different prediction directions as illustrated in Figure 7-left. In VVC, there are 65 angular prediction modes, corresponding to the 33 angular directions defined in HEVC, and further 32 directions each corresponding to a direction mid-way between an adjacent pair ( Figure 7, right).
  • the predictor samples on the reference arrays are copied along the corresponding direction inside the target PU.
  • Some predictor samples may have integral locations, in which case they match with the corresponding reference samples; the location of other predictors will have fractional parts indicating that their locations will fall between two reference samples. In the latter case, the predictor samples are interpolated using the nearest reference samples.
  • HEVC a linear interpolation of the two nearest reference samples is performed to compute the predictor sample value;
  • 4-tap filters fT[] are used which are selected depending on the intra mode direction.
  • the DC mode fills-in the prediction with the average of the samples in the L-shape (except for rectangular CUs that use average of reference samples of the longer side), and the Planar mode interpolate reference samples spatially as depicted in Figure 9.
  • the motion-info (Ml) of a neighboring block is propagated into the Ml buffer at the location of the current CU (current Ml).
  • a list of pre-determined neighboring block locations can be built.
  • the first item of the list with Ml available is selected (850) and copied into the current Ml (840).
  • the list is all the reconstructed CUs on top of a current CU, from left to right, next, all the CUs at the left from top to bottom.
  • the neighboring CU with highest number of samples contiguous to the current CU is placed on top of the list. If two CUs have same Ml, then they are considered as a same CU (number of contiguous samples are added).
  • Ml is not available may be defined as follows (several may be combined): • If current CU is at the picture border (or slice border, or tile border). If current CU is situated at the left border of the picture, then the left CU are not available.
  • the motion vectors values can be averaged (870).
  • Embodiment-2 propagate motion info along with the intra direction
  • predMode is directional
  • the direction is used to select the location (850) of the Ml to be propagated. For example, if the intra prediction uses samples from the top, the Ml candidate to be propagated (miRef) is picked up from top CUs only.
  • the MV values of several Ml may be averaged (870) if they have same reference. For example:
  • miRef (Left-Top available) ? mi( Left-Top ) : mi( Above-Left )
  • ⁇ miRef (Above-Left available) ? mi( Above-Left ) : mi( Left-Top )
  • a reference Ml is available but doesn’t have same reference, they can be re-scaled (860) using the POC of the reference so that they have same reference.
  • miRescaled miRef x (pocCur - pocRef) I (poc - pocRef)
  • miRescaled miRef are the value of the motion vector component X or Y.
  • Embodiment-3 propagate motion info with affine model
  • motion vector at sample location (x, y) in a block is derived as:
  • Embodiment-4 - use intra reconstructed samples to estimate motion parameters to propagate
  • the reconstructed samples of the current intra CU are used to estimate the best motion vector candidate to propagate.
  • a list of motion vector candidates for the current CU is built using the regular list merge candidate building in same way as for a CU coded in inter merge mode.
  • the cost of each candidate is evaluated using SATD with the reconstructed samples of the current coding unit.
  • the cost may be calculated using a reduced number of reconstructed samples (sub-part of the reconstructed CU samples). The candidate with minimal cost is selected to be propagated for the current CU.
  • Embodiment-5 propagated motion info not used for spatial candidates
  • the embodiment 4 introduces additional latency since the propagation of the motion parameters should be done after the samples of the current CU have been reconstructed. Then the propagated motion parameters cannot be used for building the motion candidates for the next CU, unless waiting for their availability what may introduce additional latency.
  • the propagated motion information for the intra CU is not used for spatial candidates but for temporal candidates only.
  • the propagated motion information for the intra CU is not used for spatial candidates in case of embodiment 4 case only.
  • the Ml propagation in the current intra block may be made per sub-block.
  • the Ml parameters of each partition may be propagated in the current block as depicted in Figure 17 examples for horizontal intra mode prediction direction (a) and diagonal intra mode prediction direction (b).
  • the neighboring Ml may be picked-up from the current CU, from the sub-partitions coded in inter as depicted in example of Figure 18.
  • the prediction signal of the top and left samples of a block coded in intra mode are well correlated with the neighboring CU reconstructed samples. That is the reason why these neighboring CU reconstructed samples are used to build the intra prediction for the current CU.
  • the other samples of the current CU (ex: right and bottom samples) may be less correlated with the neighboring (left and/or top) CU reconstructed samples.
  • the Ml parameters of the current CU may be propagated into the Ml buffer associated with the neighboring (left or top) CU coded in intra.
  • FIG. 13 One embodiment of a method 1300 under the general aspects described here is shown in Figure 13.
  • the method commences at start block 1301 and control proceeds to block 1310 for copying available motion information from neighboring blocks into a buffer.
  • Control proceeds from block 1310 to block 1320 for selecting motion information from said buffer based on an intra mode for the video block.
  • Control proceeds from block 1320 to block 1330 for encoding at least a portion of the video block using the selected motion information.
  • FIG. 14 One embodiment of a method 1400 under the general aspects described here is shown in Figure 14.
  • the method commences at start block 1401 and control proceeds to block 1410 for copying available motion information from neighboring blocks into a buffer.
  • Control proceeds from block 1410 to block 1420 for selecting motion information from said buffer based on an intra mode for the video block.
  • Control proceeds from block 1420 to block 1430 for decoding at least a portion of the video block using the selected motion information.
  • Figure 15 shows one embodiment of an apparatus 1500 for encoding, decoding, compressing, or decompressing video data using any of the above methods, or variations.
  • the apparatus comprises Processor 1510 and can be interconnected to a memory 1520 through at least one port. Both Processor 1510 and memory 1520 can also have one or more additional interconnections to external connections.
  • Processor 1510 is also configured to either insert or receive information in a bitstream and, either compressing, encoding, or decoding using any of the described aspects.
  • the embodiments described here include a variety of aspects, including tools, features, embodiments, models, approaches, etc. Many of these aspects are described with specificity and, at least to show the individual characteristics, are often described in a manner that may sound limiting. However, this is for purposes of clarity in description, and does not limit the application or scope of those aspects. Indeed, all of the different aspects can be combined and interchanged to provide further aspects. Moreover, the aspects can be combined and interchanged with aspects described in earlier filings as well.
  • Figures 1 , 2, and 16 provide some embodiments, but other embodiments are contemplated and the discussion of Figures 1 , 2, and 16 does not limit the breadth of the implementations.
  • At least one of the aspects generally relates to video encoding and decoding, and at least one other aspect generally relates to transmitting a bitstream generated or encoded.
  • These and other aspects can be implemented as a method, an apparatus, a computer readable storage medium having stored thereon instructions for encoding or decoding video data according to any of the methods described, and/or a computer readable storage medium having stored thereon a bitstream generated according to any of the methods described.
  • the terms “reconstructed” and “decoded” may be used interchangeably, the terms “pixel” and “sample” may be used interchangeably, the terms “image,” “picture” and “frame” may be used interchangeably.
  • the term “reconstructed” is used at the encoder side while “decoded” is used at the decoder side.
  • modules for example, the intra prediction, entropy coding, and/or decoding modules (160, 360, 145, 330), of a video encoder 100 and decoder 200 as shown in Figure 1 and Figure 2.
  • present aspects are not limited to WC or HEVC, and can be applied, for example, to other standards and recommendations, whether preexisting or future-developed, and extensions of any such standards and recommendations (including VVC and HEVC). Unless indicated otherwise, or technically precluded, the aspects described in this application can be used individually or in combination.
  • Figure 1 illustrates an encoder 100. Variations of this encoder 100 are contemplated, but the encoder 100 is described below for purposes of clarity without describing all expected variations.
  • the video sequence may go through pre-encoding processing (101 ), for example, applying a color transform to the input color picture (e.g., conversion from RGB 4:4:4 to YCbCr 4:2:0), or performing a remapping of the input picture components in order to get a signal distribution more resilient to compression (for instance using a histogram equalization of one of the color components).
  • Metadata can be associated with the pre-processing and attached to the bitstream.
  • a picture is encoded by the encoder elements as described below.
  • the picture to be encoded is partitioned (102) and processed in units of, for example, CUs.
  • Each unit is encoded using, for example, either an intra or inter mode.
  • intra prediction 160
  • inter mode motion estimation (175) and compensation (170) are performed.
  • the encoder decides (105) which one of the intra mode or inter mode to use for encoding the unit, and indicates the intra/inter decision by, for example, a prediction mode flag.
  • Prediction residuals are calculated, for example, by subtracting (110) the predicted block from the original image block.
  • the prediction residuals are then transformed (125) and quantized (130).
  • the quantized transform coefficients, as well as motion vectors and other syntax elements, are entropy coded (145) to output a bitstream.
  • the encoder can skip the transform and apply quantization directly to the non-transformed residual signal.
  • the encoder can bypass both transform and quantization, i.e., the residual is coded directly without the application of the transform or quantization processes.
  • the encoder decodes an encoded block to provide a reference for further predictions.
  • the quantized transform coefficients are de-quantized (140) and inverse transformed (150) to decode prediction residuals.
  • In-loop filters (165) are applied to the reconstructed picture to perform, for example, deblocking/SAO (Sample Adaptive Offset)/ALF (Adaptive Loop Filtering) filtering to reduce encoding artifacts.
  • the filtered image is stored at a reference picture buffer (180).
  • Figure 2 illustrates a block diagram of a video decoder 200.
  • a bitstream is decoded by the decoder elements as described below.
  • Video decoder 200 generally performs a decoding pass reciprocal to the encoding pass as described in Figure 1.
  • the encoder 100 also generally performs video decoding as part of encoding video data.
  • the decoded picture can further go through post-decoding processing (285), for example, an inverse color transform (e.g., conversion from YcbCr 4:2:0 to RGB 4:4:4) or an inverse remapping performing the inverse of the remapping process performed in the pre-encoding processing (101 ).
  • post-decoding processing can use metadata derived in the pre-encoding processing and signaled in the bitstream.
  • FIG 16 illustrates a block diagram of an example of a system in which various aspects and embodiments are implemented.
  • System 1000 can be embodied as a device including the various components described below and is configured to perform one or more of the aspects described in this document. Examples of such devices include, but are not limited to, various electronic devices such as personal computers, laptop computers, smartphones, tablet computers, digital multimedia set top boxes, digital television receivers, personal video recording systems, connected home appliances, and servers. Elements of system 1000, singly or in combination, can be embodied in a single integrated circuit (IC), multiple ICs, and/or discrete components. For example, in at least one embodiment, the processing and encoder/decoder elements of system 1000 are distributed across multiple ICs and/or discrete components.
  • IC integrated circuit
  • system 1000 is communicatively coupled to one or more other systems, or other electronic devices, via, for example, a communications bus or through dedicated input and/or output ports.
  • system 1000 is configured to implement one or more of the aspects described in this document.
  • the system 1000 includes at least one processor 1010 configured to execute instructions loaded therein for implementing, for example, the various aspects described in this document.
  • Processor 1010 can include embedded memory, input output interface, and various other circuitries as known in the art.
  • the system 1000 includes at least one memory 1020 (e.g., a volatile memory device, and/or a non-volatile memory device).
  • System 1000 includes a storage device 1040, which can include non-volatile memory and/or volatile memory, including, but not limited to, Electrically Erasable Programmable Read-Only Memory (EEPROM), Read-Only Memory (ROM), Programmable Read-Only Memory (PROM), Random Access Memory (RAM), Dynamic Random Access Memory (DRAM), Static Random Access Memory (SRAM), flash, magnetic disk drive, and/or optical disk drive.
  • the storage device 1040 can include an internal storage device, an attached storage device (including detachable and non-detachable storage devices), and/or a network accessible storage device, as non-limiting examples.
  • System 1000 includes an encoder/decoder module 1030 configured, for example, to process data to provide an encoded video or decoded video, and the encoder/decoder module 1030 can include its own processor and memory.
  • the encoder/decoder module 1030 represents module(s) that can be included in a device to perform the encoding and/or decoding functions. As is known, a device can include one or both of the encoding and decoding modules. Additionally, encoder/decoder module 1030 can be implemented as a separate element of system 1000 or can be incorporated within processor 1010 as a combination of hardware and software as known to those skilled in the art.
  • processor 1010 Program code to be loaded onto processor 1010 or encoder/decoder 1030 to perform the various aspects described in this document can be stored in storage device 1040 and subsequently loaded onto memory 1020 for execution by processor 1010.
  • processor 1010, memory 1020, storage device 1040, and encoder/decoder module 1030 can store one or more of various items during the performance of the processes described in this document.
  • Such stored items can include, but are not limited to, the input video, the decoded video or portions of the decoded video, the bitstream, matrices, variables, and intermediate or final results from the processing of equations, formulas, operations, and operational logic.
  • memory inside of the processor 1010 and/or the encoder/decoder module 1030 is used to store instructions and to provide working memory for processing that is needed during encoding or decoding.
  • a memory external to the processing device (for example, the processing device can be either the processor 1010 or the encoder/decoder module 1030) is used for one or more of these functions.
  • the external memory can be the memory 1020 and/or the storage device 1040, for example, a dynamic volatile memory and/or a non-volatile flash memory.
  • an external non-volatile flash memory is used to store the operating system of, for example, a television.
  • a fast external dynamic volatile memory such as a RAM is used as working memory for video coding and decoding operations, such as for MPEG-2 (MPEG refers to the Moving Picture Experts Group, MPEG-2 is also referred to as ISO/IEC 13818, and 13818-1 is also known as H.222, and 13818-2 is also known as H.262), HEVC (HEVC refers to High Efficiency Video Coding, also known as H.265 and MPEG-H Part 2), or WC (Versatile Video Coding, a new standard being developed by JVET, the Joint Video Experts Team).
  • MPEG-2 MPEG refers to the Moving Picture Experts Group
  • MPEG-2 is also referred to as ISO/IEC 13818
  • 13818-1 is also known as H.222
  • 13818-2 is also known as H.262
  • HEVC High Efficiency Video Coding
  • WC Very Video Coding
  • the input to the elements of system 1000 can be provided through various input devices as indicated in block 1130.
  • Such input devices include, but are not limited to, (i) a radio frequency (RF) portion that receives an RF signal transmitted, for example, over the air by a broadcaster, (ii) a Component (COMP) input terminal (or a set of COMP input terminals), (iii) a Universal Serial Bus (USB) input terminal, and/or (iv) a High- Definition Multimedia Interface (HDMI) input terminal.
  • RF radio frequency
  • COMP Component
  • USB Universal Serial Bus
  • HDMI High- Definition Multimedia Interface
  • the input devices of block 1130 have associated respective input processing elements as known in the art.
  • the RF portion can be associated with elements suitable for (i) selecting a desired frequency (also referred to as selecting a signal, or band-limiting a signal to a band of frequencies), (ii) downconverting the selected signal, (iii) band-limiting again to a narrower band of frequencies to select (for example) a signal frequency band which can be referred to as a channel in certain embodiments, (iv) demodulating the downconverted and band-limited signal, (v) performing error correction, and (vi) demultiplexing to select the desired stream of data packets.
  • the RF portion of various embodiments includes one or more elements to perform these functions, for example, frequency selectors, signal selectors, bandlimiters, channel selectors, filters, downconverters, demodulators, error correctors, and demultiplexers.
  • the RF portion can include a tuner that performs various of these functions, including, for example, downconverting the received signal to a lower frequency (for example, an intermediate frequency or a near-baseband frequency) or to baseband.
  • the RF portion and its associated input processing element receives an RF signal transmitted over a wired (for example, cable) medium, and performs frequency selection by filtering, downconverting, and filtering again to a desired frequency band.
  • Adding elements can include inserting elements in between existing elements, such as, for example, inserting amplifiers and an analog-to-digital converter.
  • the RF portion includes an antenna.
  • USB and/or HDMI terminals can include respective interface processors for connecting system 1000 to other electronic devices across USB and/or HDMI connections.
  • various aspects of input processing for example, Reed-Solomon error correction
  • aspects of USB or HDMI interface processing can be implemented within separate interface les or within processor 1010 as necessary.
  • the demodulated, error corrected, and demultiplexed stream is provided to various processing elements, including, for example, processor 1010, and encoder/decoder 1030 operating in combination with the memory and storage elements to process the datastream as necessary for presentation on an output device.
  • Various elements of system 1000 can be provided within an integrated housing, Within the integrated housing, the various elements can be interconnected and transmit data therebetween using suitable connection arrangement, for example, an internal bus as known in the art, including the Inter-IC (I2C) bus, wiring, and printed circuit boards.
  • I2C Inter-IC
  • the system 1000 includes communication interface 1050 that enables communication with other devices via communication channel 1060.
  • the communication interface 1050 can include, but is not limited to, a transceiver configured to transmit and to receive data over communication channel 1060.
  • the communication interface 1050 can include, but is not limited to, a modem or network card and the communication channel 1060 can be implemented, for example, within a wired and/or a wireless medium.
  • Wi-Fi Wireless Fidelity
  • IEEE 802.11 IEEE refers to the Institute of Electrical and Electronics Engineers
  • the Wi-Fi signal of these embodiments is received over the communications channel 1060 and the communications interface 1050 which are adapted for Wi-Fi communications.
  • the communications channel 1060 of these embodiments is typically connected to an access point or router that provides access to external networks including the Internet for allowing streaming applications and other over-the-top communications.
  • Other embodiments provide streamed data to the system 1000 using a set-top box that delivers the data over the HDMI connection of the input block 1130.
  • Still other embodiments provide streamed data to the system 1000 using the RF connection of the input block 1130.
  • various embodiments provide data in a non-streaming manner.
  • various embodiments use wireless networks other than Wi-Fi, for example a cellular network or a Bluetooth network.
  • the system 1000 can provide an output signal to various output devices, including a display 1100, speakers 1110, and other peripheral devices 1120.
  • the display 1100 of various embodiments includes one or more of, for example, a touchscreen display, an organic light-emitting diode (OLED) display, a curved display, and/or a foldable display.
  • the display 1100 can be for a television, a tablet, a laptop, a cell phone (mobile phone), or another device.
  • the display 1100 can also be integrated with other components (for example, as in a smart phone), or separate (for example, an external monitor for a laptop).
  • the other peripheral devices 1120 include, in various examples of embodiments, one or more of a stand-alone digital video disc (or digital versatile disc) (DVR, for both terms), a disk player, a stereo system, and/or a lighting system.
  • Various embodiments use one or more peripheral devices 1120 that provide a function based on the output of the system 1000. For example, a disk player performs the function of playing the output of the system 1000.
  • control signals are communicated between the system 1000 and the display 1100, speakers 1110, or other peripheral devices 1120 using signaling such as AV. Link, Consumer Electronics Control (CEC), or other communications protocols that enable device-to-device control with or without user intervention.
  • the output devices can be communicatively coupled to system 1000 via dedicated connections through respective interfaces 1070, 1080, and 1090. Alternatively, the output devices can be connected to system 1000 using the communications channel 1060 via the communications interface 1050.
  • the display 1100 and speakers 1110 can be integrated in a single unit with the other components of system 1000 in an electronic device such as, for example, a television.
  • the display interface 1070 includes a display driver, such as, for example, a timing controller (T Con) chip.
  • the display 1100 and speaker 1110 can alternatively be separate from one or more of the other components, for example, if the RF portion of input 1130 is part of a separate set-top box.
  • the output signal can be provided via dedicated output connections, including, for example, HDMI ports, USB ports, or COMP outputs.
  • the embodiments can be carried out by computer software implemented by the processor 1010 or by hardware, or by a combination of hardware and software. As a nonlimiting example, the embodiments can be implemented by one or more integrated circuits.
  • the memory 1020 can be of any type appropriate to the technical environment and can be implemented using any appropriate data storage technology, such as optical memory devices, magnetic memory devices, semiconductor-based memory devices, fixed memory, and removable memory, as non-limiting examples.
  • the processor 1010 can be of any type appropriate to the technical environment, and can encompass one or more of microprocessors, general purpose computers, special purpose computers, and processors based on a multi-core architecture, as non-limiting examples.
  • Decoding can encompass all or part of the processes performed, for example, on a received encoded sequence to produce a final output suitable for display.
  • processes include one or more of the processes typically performed by a decoder, for example, entropy decoding, inverse quantization, inverse transformation, and differential decoding.
  • processes also, or alternatively, include processes performed by a decoder of various implementations described in this application.
  • decoding refers only to entropy decoding
  • decoding refers only to differential decoding
  • decoding refers to a combination of entropy decoding and differential decoding.
  • encoding can encompass all or part of the processes performed, for example, on an input video sequence to produce an encoded bitstream.
  • processes include one or more of the processes typically performed by an encoder, for example, partitioning, differential encoding, transformation, quantization, and entropy encoding.
  • processes also, or alternatively, include processes performed by an encoder of various implementations described in this application.
  • encoding refers only to entropy encoding
  • encoding refers only to differential encoding
  • encoding refers to a combination of differential encoding and entropy encoding.
  • syntax elements as used herein are descriptive terms. As such, they do not preclude the use of other syntax element names.
  • Various embodiments may refer to parametric models or rate distortion optimization.
  • the balance or trade-off between the rate and distortion is usually considered, often given the constraints of computational complexity. It can be measured through a Rate Distortion Optimization (RDO) metric, or through Least Mean Square (LMS), Mean of Absolute Errors (MAE), or other such measurements.
  • RDO Rate Distortion Optimization
  • LMS Least Mean Square
  • MAE Mean of Absolute Errors
  • Rate distortion optimization is usually formulated as minimizing a rate distortion function, which is a weighted sum of the rate and of the distortion. There are different approaches to solve the rate distortion optimization problem.
  • the approaches may be based on an extensive testing of all encoding options, including all considered modes or coding parameters values, with a complete evaluation of their coding cost and related distortion of the reconstructed signal after coding and decoding.
  • Faster approaches may also be used, to save encoding complexity, in particular with computation of an approximated distortion based on the prediction or the prediction residual signal, not the reconstructed one.
  • Mix of these two approaches can also be used, such as by using an approximated distortion for only some of the possible encoding options, and a complete distortion for other encoding options.
  • Other approaches only evaluate a subset of the possible encoding options. More generally, many approaches employ any of a variety of techniques to perform the optimization, but the optimization is not necessarily a complete evaluation of both the coding cost and related distortion.
  • the implementations and aspects described herein can be implemented in, for example, a method or a process, an apparatus, a software program, a data stream, or a signal. Even if only discussed in the context of a single form of implementation (for example, discussed only as a method), the implementation of features discussed can also be implemented in other forms (for example, an apparatus or program).
  • An apparatus can be implemented in, for example, appropriate hardware, software, and firmware.
  • the methods can be implemented in, for example, a processor, which refers to processing devices in general, including, for example, a computer, a microprocessor, an integrated circuit, or a programmable logic device. Processors also include communication devices, such as, for example, computers, cell phones, portable/personal digital assistants (“PDAs”), and other devices that facilitate communication of information between endusers.
  • PDAs portable/personal digital assistants
  • references to “one embodiment” or “an embodiment” or “one implementation” or “an implementation”, as well as other variations thereof, means that a particular feature, structure, characteristic, and so forth described in connection with the embodiment is included in at least one embodiment.
  • the appearances of the phrase “in one embodiment” or “in an embodiment” or “in one implementation” or “in an implementation”, as well any other variations, appearing in various places throughout this application are not necessarily all referring to the same embodiment.
  • Determining the information can include one or more of, for example, estimating the information, calculating the information, predicting the information, or retrieving the information from memory.
  • Accessing the information can include one or more of, for example, receiving the information, retrieving the information (for example, from memory), storing the information, moving the information, copying the information, calculating the information, determining the information, predicting the information, or estimating the information.
  • this application may refer to “receiving” various pieces of information.
  • Receiving is, as with “accessing”, intended to be a broad term.
  • Receiving the information can include one or more of, for example, accessing the information, or retrieving the information (for example, from memory).
  • “receiving” is typically involved, in one way or another, during operations such as, for example, storing the information, processing the information, transmitting the information, moving the information, copying the information, erasing the information, calculating the information, determining the information, predicting the information, or estimating the information.
  • any of the following “and/or”, and “at least one of”, for example, in the cases of “A/B”, “A and/or B” and “at least one of A and B”, is intended to encompass the selection of the first listed option (A) only, or the selection of the second listed option (B) only, or the selection of both options (A and B).
  • such phrasing is intended to encompass the selection of the first listed option (A) only, or the selection of the second listed option (B) only, or the selection of the third listed option (C) only, or the selection of the first and the second listed options (A and B) only, or the selection of the first and third listed options (A and C) only, or the selection of the second and third listed options (B and C) only, or the selection of all three options (A and B and C).
  • This may be extended, as is clear to one of ordinary skill in this and related arts, for as many items as are listed.
  • the word “signal” refers to, among other things, indicating something to a corresponding decoder.
  • the encoder signals a particular one of a plurality of transforms, coding modes or flags.
  • the same transform, parameter, or mode is used at both the encoder side and the decoder side.
  • an encoder can transmit (explicit signaling) a particular parameter to the decoder so that the decoder can use the same particular parameter.
  • signaling can be used without transmitting (implicit signaling) to simply allow the decoder to know and select the particular parameter.
  • signaling can be accomplished in a variety of ways. For example, one or more syntax elements, flags, and so forth are used to signal information to a corresponding decoder in various embodiments. While the preceding relates to the verb form of the word “signal”, the word “signal” can also be used herein as a noun.
  • implementations can produce a variety of signals formatted to carry information that can be, for example, stored or transmitted.
  • the information can include, for example, instructions for performing a method, or data produced by one of the described implementations.
  • a signal can be formatted to carry the bitstream of a described embodiment.
  • Such a signal can be formatted, for example, as an electromagnetic wave (for example, using a radio frequency portion of spectrum) or as a baseband signal.
  • the formatting can include, for example, encoding a data stream and modulating a carrier with the encoded data stream.
  • the information that the signal carries can be, for example, analog or digital information.
  • the signal can be transmitted over a variety of different wired or wireless links, as is known.
  • the signal can be stored on a processor-readable medium.
  • One embodiment comprises copying motion information to a buffer from neighboring blocks to be used for intra coding/decoding a current video block.
  • One embodiment comprises using the above buffer information to code/decode a video block.
  • One embodiment comprises averaging the motion vectors from two or more motion information when they have identical references.
  • affine model comprises said motion information
  • inventions comprise any of the above methods wherein reconstructed samples of a current intra coded coding unit are used to estimate a motion vector candidate to propagate to the buffer.
  • One embodiment comprises a bitstream or signal that includes one or more syntax elements to perform the above functions, or variations thereof.
  • One embodiment comprises a bitstream or signal that includes syntax conveying information generated according to any of the embodiments described.
  • One embodiment comprises creating and/or transmitting and/or receiving and/or decoding according to any of the embodiments described.
  • One embodiment comprises a method, process, apparatus, medium storing instructions, medium storing data, or signal according to any of the embodiments described.
  • One embodiment comprises inserting in the signaling syntax elements that enable the decoder to determine decoding information in a manner corresponding to that used by an encoder.
  • One embodiment comprises creating and/or transmitting and/or receiving and/or decoding a bitstream or signal that includes one or more of the described syntax elements, or variations thereof.
  • One embodiment comprises a TV, set-top box, cell phone, tablet, or other electronic device that performs transform method(s) according to any of the embodiments described.
  • One embodiment comprises a TV, set-top box, cell phone, tablet, or other electronic device that performs transform method(s) determination according to any of the embodiments described, and that displays (e.g., using a monitor, screen, or other type of display) a resulting image.
  • One embodiment comprises a TV, set-top box, cell phone, tablet, or other electronic device that selects, bandlimits, or tunes (e.g., using a tuner) a channel to receive a signal including an encoded image, and performs transform method(s) according to any of the embodiments described.
  • One embodiment comprises a TV, set-top box, cell phone, tablet, or other electronic device that receives (e.g., using an antenna) a signal over the air that includes an encoded image, and performs transform method(s).

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

Des procédés et un appareil pour remplir un tampon d'informations de mouvement avec des unités de codage ou des sous-blocs d'unités de codage qui sont codées en mode intra comprennent la sélection de paramètres d'inter-prédiction voisins dans le tampon d'informations de mouvement à l'aide d'une direction de prédiction intra. Dans un mode de réalisation, la mise à l'échelle de paramètres d'inter-prédiction est effectué à nouveau. En variante, des informations de mouvement telles que des vecteurs de mouvement peuvent être moyennées ou un modèle affine peut être appliqué avant le stockage des paramètres dans un tampon d'informations de mouvement.
PCT/EP2023/057365 2022-04-07 2023-03-22 Propagation de paramètres d'informations de mouvement sur la base d'une direction de prédiction intra WO2023194106A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100142622A1 (en) * 2008-12-09 2010-06-10 Canon Kabushiki Kaisha Video coding method and device
US20170214932A1 (en) * 2014-07-18 2017-07-27 Mediatek Singapore Pte. Ltd Method of Motion Vector Derivation for Video Coding
US20180376164A1 (en) * 2017-06-26 2018-12-27 Qualcomm Incorporated Motion information propagation in video coding

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100142622A1 (en) * 2008-12-09 2010-06-10 Canon Kabushiki Kaisha Video coding method and device
US20170214932A1 (en) * 2014-07-18 2017-07-27 Mediatek Singapore Pte. Ltd Method of Motion Vector Derivation for Video Coding
US20180376164A1 (en) * 2017-06-26 2018-12-27 Qualcomm Incorporated Motion information propagation in video coding

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